How do I keep two systems in sync without double entry?
Short answer
Pick one system as the source of truth for each record type, connect it to the other with a native integration or automation connector, and never edit the same field in both places. Review the sync log weekly so drift gets caught before it becomes a real discrepancy.
Before you start
- A list of every system that shares data with TactStack.
- Clarity on which records each system owns.
- Admin access to configure connectors on both sides.
- A recurring time set aside for reconciliation checks.
Step by step
- 1
Map what lives where
List every record type, contacts, invoices, jobs, and note which system currently owns each one.
You cannot design a sync without knowing what is duplicated today.
- 2
Assign one source of truth per record type
Contacts might live in TactStack while payroll stays in another tool, for example.
Two systems editing the same record independently guarantees conflicts.
- 3
Connect with a native integration where possible
Native integrations handle field types and edge cases more reliably than generic connectors.
Fewer moving parts means fewer places for sync to quietly fail.
- 4
Use a connector for anything without a native option
Set clear triggers, such as record created or status changed, rather than syncing every field edit.
Event-based syncing is easier to debug than syncing everything constantly.
- 5
Lock editing to the source system
Train the team to edit a record only in the system that owns it.
Edits made on the mirrored side get overwritten or create conflicting versions.
- 6
Build a simple sync log review
Check a weekly report of failed or skipped syncs rather than waiting for someone to notice missing data.
Silent failures are the most common way two systems quietly drift apart.
- 7
Reconcile counts periodically
Compare record counts and key totals between systems monthly.
A count mismatch is often the first sign of a broken sync.
What good looks like
- No one re-types the same information in two places.
- Each record has one clear owner and one accurate version.
- Sync failures get caught within days, not months.
- New team members know exactly where to make an edit.
Common mistakes
The ways this goes wrong in setup, and what to do instead.
No agreed source of truth›
Both systems get edited and whichever synced last silently wins.
Do this instead: Assign one owning system per record type and document it for the whole team.
Syncing on every field change›
Minor edits trigger constant syncs that are hard to trace when something goes wrong.
Do this instead: Sync on meaningful events like creation or status change instead of every field update.
Nobody checks the sync log›
A connector breaks quietly and two systems drift apart for weeks before anyone notices.
Do this instead: Review the sync log weekly and reconcile record counts on a monthly schedule.
Frequently asked
5 questions about keep two systems in syncRelated guides
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